Microwave oven



FIG. 1 is a front elevational view of a microwave oven showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a perspective view thereof.

The back feature shown grayed out forms no part of the claimed design. 

CLAIM An ornamental design for a microwave oven, as shown, and described. 